输入用户名查询是否存在

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
import java.util.Set;

public class UserTest {

    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        System.out.println("请输入用户名：");
        String uname=sc.next();
        System.out.println("请输入密码：");
        String passwd=sc.next();
        User u=new User(uname,passwd);
        Map<String,User> map=new HashMap<String,User>();
        map.put("张三",new User("张三","123"));
        map.put("李四",new User("李四","152"));
        map.put("王五",new User("王五","432"));
        map.put("赵六",new User("赵六","142"));
        map.put("唐七",new User("唐七","846"));
        Set<Map.Entry<String,User>> entries=map.entrySet();
        boolean flags=false;
        for(Map.Entry<String,User> e:entries){
            if(e.getKey().equals(uname)&&e.getValue().getUsername().equals(uname)&&e.getValue().getPassword().equals(passwd)){//&&e.getValue().equals(e)
                System.out.println("含有该用户的信息！");
                flags=true;
                break;
            }
        }
        if(flags==false){
            System.out.println("系统未查询到该用户的信息！");
        }
    }
}

class User {
    String username;
    String password;

    public User(String username, String password) {
        super();
        this.username = username;
        this.password = password;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "User [username=" + username + ", password=" + password + "]";
    }

}